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Leases (Notes)
12 Months Ended
Sep. 30, 2023
Leases [Abstract]  
Lessee, Finance Leases
9.  LEASES

We enter into various contractual arrangements for the right to use facilities, vehicles and equipment. The lease term generally ranges from two to ten years for facilities and three to five years for vehicles and equipment. Our lease terms may include the exercise of renewal or termination options when it is reasonably certain these options will be exercised. Our lease agreements do not contain any material residual value guarantees or restrictive covenants.

Current operating lease liabilities were $19,496 and $17,319, respectively, as of September 30, 2023 and 2022, and current finance lease liabilities were $4,301 and $2,928, respectively, as of September 30, 2023 and 2022. Current operating and finance lease liabilities were included in "Accounts payable and accrued expenses" in the Consolidated Balance Sheets as of September 30, 2023 and 2022. Non-current finance lease liabilities and finance lease right-of-use assets were included in the "Other non-current liabilities" and "Other non-current assets", respectively, in the Consolidated Balance Sheets.
The maturities of our lease liabilities as of September 30, 2023, are as follows:
Operating LeasesFinance LeasesTotal
2024$20,020 $4,436 $24,456 
202516,239 4,204 20,443 
202612,662 3,338 16,000 
20279,362 1,598 10,960 
20285,043 155 5,198 
Thereafter6,236 — 6,236 
Total undiscounted lease payments$69,562 $13,731 $83,293 
Less: imputed interest7,968 1,332 9,300 
Present value of lease liabilities$61,594 $12,399 $73,993 
The total future undiscounted cash flows related to lease agreements committed to but not yet commenced as of September 30, 2023, is $9,616.

Lease cost recognized in our Consolidated Statements of Comprehensive Income is summarized as follows:
Year Ended September 30,
202320222021
Operating lease cost $18,501 $16,000 $13,405 
Finance lease cost
Amortization of lease assets3,603 1,729 634 
Interest on lease liabilities746 269 119 
Finance lease cost4,349 1,998 753 
Short-term lease cost1,883 2,426 1,575 
Variable lease cost2,805 1,900 1,286 
Total lease cost$27,538 $22,324 $17,019 

Other information about lease amounts recognized in our Consolidated Financial Statements is summarized as follows:
Year Ended September 30,
202320222021
Operating cash flows used for operating leases$22,022 $20,799 $15,011 
Operating cash flows used for finance leases746 269 119 
Right-of-use assets obtained in exchange for new operating lease liabilities27,491 31,422 24,606 
Right-of-use assets obtained in exchange for new finance lease liabilities5,973 7,950 2,962 
Year Ended September 30,
20232022
Weighted-average remaining lease term - operating leases4.5 years4.8 years
Weighted-average remaining lease term - finance leases3.4 years3.9 years
Weighted-average discount rate - operating leases5.1 %4.0 %
Weighted-average discount rate - finance leases6.0 %4.7 %

For a discussion of leases with certain related parties which are included above, see Note 13, “Related-Party Transactions.”
Rent expense was $20,384, $18,426 and $14,980 for the years ended September 30, 2023, 2022 and 2021, respectively.
Lessee, Operating Leases
9.  LEASES

We enter into various contractual arrangements for the right to use facilities, vehicles and equipment. The lease term generally ranges from two to ten years for facilities and three to five years for vehicles and equipment. Our lease terms may include the exercise of renewal or termination options when it is reasonably certain these options will be exercised. Our lease agreements do not contain any material residual value guarantees or restrictive covenants.

Current operating lease liabilities were $19,496 and $17,319, respectively, as of September 30, 2023 and 2022, and current finance lease liabilities were $4,301 and $2,928, respectively, as of September 30, 2023 and 2022. Current operating and finance lease liabilities were included in "Accounts payable and accrued expenses" in the Consolidated Balance Sheets as of September 30, 2023 and 2022. Non-current finance lease liabilities and finance lease right-of-use assets were included in the "Other non-current liabilities" and "Other non-current assets", respectively, in the Consolidated Balance Sheets.
The maturities of our lease liabilities as of September 30, 2023, are as follows:
Operating LeasesFinance LeasesTotal
2024$20,020 $4,436 $24,456 
202516,239 4,204 20,443 
202612,662 3,338 16,000 
20279,362 1,598 10,960 
20285,043 155 5,198 
Thereafter6,236 — 6,236 
Total undiscounted lease payments$69,562 $13,731 $83,293 
Less: imputed interest7,968 1,332 9,300 
Present value of lease liabilities$61,594 $12,399 $73,993 
The total future undiscounted cash flows related to lease agreements committed to but not yet commenced as of September 30, 2023, is $9,616.

Lease cost recognized in our Consolidated Statements of Comprehensive Income is summarized as follows:
Year Ended September 30,
202320222021
Operating lease cost $18,501 $16,000 $13,405 
Finance lease cost
Amortization of lease assets3,603 1,729 634 
Interest on lease liabilities746 269 119 
Finance lease cost4,349 1,998 753 
Short-term lease cost1,883 2,426 1,575 
Variable lease cost2,805 1,900 1,286 
Total lease cost$27,538 $22,324 $17,019 

Other information about lease amounts recognized in our Consolidated Financial Statements is summarized as follows:
Year Ended September 30,
202320222021
Operating cash flows used for operating leases$22,022 $20,799 $15,011 
Operating cash flows used for finance leases746 269 119 
Right-of-use assets obtained in exchange for new operating lease liabilities27,491 31,422 24,606 
Right-of-use assets obtained in exchange for new finance lease liabilities5,973 7,950 2,962 
Year Ended September 30,
20232022
Weighted-average remaining lease term - operating leases4.5 years4.8 years
Weighted-average remaining lease term - finance leases3.4 years3.9 years
Weighted-average discount rate - operating leases5.1 %4.0 %
Weighted-average discount rate - finance leases6.0 %4.7 %

For a discussion of leases with certain related parties which are included above, see Note 13, “Related-Party Transactions.”
Rent expense was $20,384, $18,426 and $14,980 for the years ended September 30, 2023, 2022 and 2021, respectively.